Search found 12 matches
- Fri Sep 29, 2017 9:06 am
- Forum: General Motors
- Topic: Reading 1994 Buick Century "Service Engine Soon" c
- Replies: 11
- Views: 19177
Thank you for that information. I ordered a FTDI part off eBay. What came was the Prolific part. I might look into trying to get another bridge that really is FTDI to see if I can get this to work. In the meantime the Snap On tester said I had a bad TPS ( throttle position sensor ), bad park/neutral...
- Fri Sep 08, 2017 11:27 am
- Forum: General Motors
- Topic: Reading 1994 Buick Century "Service Engine Soon" c
- Replies: 11
- Views: 19177
I had to give up trying to use Tuner Pro for now. Found an auto repair shop that read the 1994 Buick code with a Snap On tester for $20. It said the Throttle Position Sensor was at +4.92 volts all the time. Removed the TPS and found it open circuit. Fortunately I have a spare. I haven't given up on ...
- Fri Aug 04, 2017 1:14 pm
- Forum: General Motors
- Topic: Reading 1994 Buick Century "Service Engine Soon" c
- Replies: 11
- Views: 19177
- Fri Aug 04, 2017 2:20 am
- Forum: General Motors
- Topic: Who Needs An ADS or ADX?
- Replies: 390
- Views: 1671933
- Wed Jul 19, 2017 6:16 pm
- Forum: General Motors
- Topic: MEFI ADX Connection Problem
- Replies: 5
- Views: 10543
Just a thought. I am new to this myself and just was able to get the Tuner ProRT software working with my L82 engine. The first thing I checked was what the voltage levels are from the DLC. I understand it can be 0-5 volts or 0-12 volts. 0-5 volts is TTL levels which the USB to Serial TTL adapter ca...
- Wed Jul 19, 2017 2:57 pm
- Forum: General Motors
- Topic: Reading 1994 Buick Century "Service Engine Soon" c
- Replies: 11
- Views: 19177
1FA definition worked! So the OBD1 compliant Buick has an OBD2 data stream. Found my problem too. Error in EGR solenoid 3. Might have to cough up the $39 for Tuner ProRT. Too bad it takes so much effort to find out if it will work but I guess there is so much confusion with these 94 and 95 cars that...
- Wed Jul 19, 2017 2:34 pm
- Forum: General Motors
- Topic: Reading 1994 Buick Century "Service Engine Soon" c
- Replies: 11
- Views: 19177
It worked. The I/O Gear GUC232 USB to RS232 adapter followed by the Maxim MAX232 RS232 to TTL chip allowed me to connect up. The MAX232 is running off an HP6205C power supply at the moment because it needs +5 VDC. I loaded the wrong definition file though. I used A247 from the OBD1 list because this...
- Tue Jul 18, 2017 4:40 pm
- Forum: General Motors
- Topic: Reading 1994 Buick Century "Service Engine Soon" c
- Replies: 11
- Views: 19177
I built the little two transistor converter from RS232 to aldl and vice versa from the paper above. It seems to be the same circuit shown here. http://forums.parallax.com/discussion/131711/parallax-usb-rs232-converter-diy-aldl-odb1-cable I should have realized it would not work. The I/O Gear USB to ...
- Tue Jul 18, 2017 9:07 am
- Forum: General Motors
- Topic: Reading 1994 Buick Century "Service Engine Soon" c
- Replies: 11
- Views: 19177
I am making some progress. Found this article about vehicles of this vintage. http://www.academia.edu/1963748/A_Simple_Serial_Data_Interface_for_OBD-I_Compliant_General_Motors_Vehicles_1982-1995_ I bought an I/O Gear GUC232 adapter from a local store for $10. Installed it on my laptop. Set it to por...
- Sun Jul 16, 2017 1:29 pm
- Forum: General Motors
- Topic: Reading 1994 Buick Century "Service Engine Soon" c
- Replies: 11
- Views: 19177
I discovered something new from Wikipedia regarding OBD1. General Motors, some 1989–1995 Ford vehicles (DCL), and some 1989–1995 Toyota/Lexus vehicles have a live sensor data stream available, however, many other OBD-I equipped vehicles do not This 1994 has live sensor data stream according to t...
- Fri Jul 14, 2017 12:41 pm
- Forum: General Motors
- Topic: Reading 1994 Buick Century "Service Engine Soon" c
- Replies: 11
- Views: 19177
- Thu Jul 13, 2017 2:18 pm
- Forum: General Motors
- Topic: Reading 1994 Buick Century "Service Engine Soon" c
- Replies: 11
- Views: 19177
Reading 1994 Buick Century "Service Engine Soon" c
I have a 1994 Buick Century. The emissions sticker says it is OBD1 compliant. It has a 12 pin aldl connector with only three pins. 1. Pin A is black/white ground 2. Pin M is an orange wire - serial data signal 3. Pin K is a purple wire - diagnostic enable signal The above descriptions of the wires a...